Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first image in a sequence according to a first embodiment of our design for a display screen or portion thereof with transitional graphical user interface;

FIG. 2 is a front view of a second image in the sequence thereof;

FIG. 3 is a front view of a third image in the sequence thereof;

FIG. 4 is a front view of a fourth image in the sequence thereof;

FIG. 5 is a front view of a fifth image in the sequence thereof;

FIG. 6 is a front view of a sixth image in the sequence thereof;

FIG. 7 is a front view of a seventh image in the sequence thereof;

FIG. 8 is a front view of a eighth image in the sequence thereof;

FIG. 9 is a front view of a ninth image in the sequence thereof;

FIG. 10 is a front view of a tenth image in the sequence thereof;

FIG. 11 is a front view of a first image in a sequence according to a second embodiment of our design for a display screen or portion thereof with transitional graphical user interface;

FIG. 12 is a front view of a second image in the sequence thereof;

FIG. 13 is a front view of a third image in the sequence thereof;

FIG. 14 is a front view of a fourth image in the sequence thereof;

FIG. 15 is a front view of a fifth image in the sequence thereof;

FIG. 16 is a front view of a sixth image in the sequence thereof;

FIG. 17 is a front view of a seventh image in the sequence thereof;

FIG. 18 is a front view of a eighth image in the sequence thereof;

FIG. 19 is a front view of a ninth image in the sequence thereof;

FIG. 20 is a front view of a tenth image in the sequence thereof;

FIG. 21 is a front view of a eleventh image in the sequence thereof; and,

FIG. 22 is a front view of a twelfth image in the sequence thereof.

The appearance of the claimed design transitions between the images shown in FIGS. 1 through 10 and between the images shown in FIGS. 11 through 22, respectively. The process or period in which one image transitions to another forms no part of the claimed design.

The two outermost broken lines showing an electronic device and the edge outline of a display screen illustrate environmental subject matter. All other broken lines showing portions of the graphical user interface illustrate portions of the article. None of the aforementioned broken line subject matter forms part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 